My car is a 2007 Chevy cobalt ls 2.2 5 speed.

It's is throwing out a bunch of codes saying something about the circuit. The parts that codes are throwing. Are both upstream and down stream o2 sensors mass or volume air sensor purge control valve and clutch pedal switch b circuit. Please help me. If you need more info I can gladly give it.

Dealership told me to look around ground wires because the may share a common ground wire. Where are my ground wires located?